MOLECULAR STARK EFFECT MEASUREMENTS IN BROADBAND CHIRPED-PULSE FOURIER TRANSFORM MICROWAVE (CP-FTMW) SPECTROMETERS
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Abstract
We demonstrate the implementation of molecular Stark effect measurements in broadband, chirped-pulse Fourier transform microwave (CP-FTMW) spectrometers. For broadband spectroscopy, the dipole moment determination is performed by measuring the full, broadband spectrum (7 - 18 GHz) at a single electric field strength. The electric field strength is calibrated internally using the first order Stark shift of trifluoropropyne (2.317 D) which is added in a trace amount to the sample mixture. The molecular rotational spectrum in the applied electric field is fit to the rotational Hamiltonian with the rotational and distortion constants fixed at their field-free values. The only parameters varied in the fit are the Stark interaction terms (
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Emilsson, T. et al.
Author Institution: Department of Chemistry, University of Virginia, McCormick Rd., P.O. Box 400319, Charlottesville, VA 22904; Universidad de Valladolid, Departmento Quimica Fisica y Quimica Inorganica, Facultad de Ciencias, Prado de la Magdalena, s/n, 47005 Valladolid, Spain